public class Test {
    public static void main(String[] args) {
        MySignalLinkedList mySignalLinkedList = new MySignalLinkedList();

        mySignalLinkedList.addFirst(56);
        mySignalLinkedList.addFirst(45);
        mySignalLinkedList.addFirst(34);
        mySignalLinkedList.addFirst(23);
        mySignalLinkedList.addFirst(12);
        mySignalLinkedList.show();
        System.out.println();

        mySignalLinkedList.addLast(666);
        mySignalLinkedList.show();

        System.out.println();
        System.out.println("==========");
        mySignalLinkedList.clear();
        mySignalLinkedList.show();


    }
}